So you're looking to host a webinar with over 1,000 people attending. Now you're cooking with gas, and looking at the finest way to present to your audience.
This is a huge deal. When you're presenting to that many people at one time, the way you present to them matters. Tremendously.
Context is everything-- not just in webinar software, but in everything. If you took virtually anything that was in a modern art museum and put it in a garage sale... consider what that might do to the perceived value of any said item.